echinoderm

(redirected from Echinoderma)
Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

e·chi·no·derm

(e-kī'nō-derm),
A member of the phylum Echinodermata.

echinoderm

any member of the phylum Echinodermata, including the sea urchins, starfish, brittle-stars, sea cucumbers, feather stars and sea lillies. The phylum is characterized by a pentaradiate structure (a five-sided RADIAL SYMMETRY) and the presence of tube feet in most forms.